remove as_str() legacy wrappers, callers use .into() directly

swarm-controller/src/webhook.rs

@@ -215,7 +215,7 @@ impl DeliveryKind {
         format!(
             "{}{ROUTE_PREFIX}{}",
             public_base.trim_end_matches('/'),
-            self.as_str()
+            <&str>::from(self)
         )
     }
 
@@ -229,18 +229,6 @@ impl DeliveryKind {
     fn parse(segment: &str) -> Option<Self> {
         segment.parse().ok()
     }
-
-    /// Stable string form, used for logging. Deliberately the same spelling
-    /// as the path segment so a journal line can be matched against a
-    /// registered URL.
-    ///
-    /// ⚠️ **Not the routing key for the swarm→hive message.** That message is
-    /// semantic (*knowledge repo changed*, *deploy agent X at rev Y*) and is
-    /// addressed to the hives that need it; which hook a delivery arrived on
-    /// is an input to deriving it, not the thing sent.
-    fn as_str(self) -> &'static str {
-        self.into()
-    }
 }
 
 /// Why a delivery was refused.
@@ -377,7 +365,7 @@ pub(super) async fn post_webhook_forge(
     };
 
     tracing::info!(
-        kind = kind.as_str(),
+        kind = <&str>::from(kind),
         bytes = body.len(),
         "webhook: verified delivery"
     );